Mozilla launches video accessibility drive


 
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Old 10-13-2008
Mozilla launches video accessibility drive

10-13-2008 01:00 PM
Video and audio support will soon be built directly into Firefox, by way of the free Vorbis and Theora codecs, and Mozilla is using the opportunity to advance multimedia accessibility for hearing-impaired and seeing-impaired users. Although HTML 5 does not officially include Ogg Vorbis and Theora as baseline codecs for the new VIDEO and AUDIO tags, Mozilla has adopted them for its own implementation. Researcher Silvia Pfeiffer is leading a Mozilla Foundation-funded effort to integrate support for closed captioning and other multimedia accessibility features into the Ogg formats and their implementation in Firefox.



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ESMERGE(1)							   User Commands							ESMERGE(1)

NAME
esmerge - merge audio and video ES into a TS DESCRIPTION
Usage: esmerge [switches] <video-file> <audio-file> <output-file> TS tools version 1.11, esmerge built Nov 11 2008 17:15:46 Merge the contents of two Elementary Stream (ES) files, one containing video data, and the other audio, to produce an output file containing Transport Stream (TS). Files: <video-file> is the ES file containing video. <audio-file> is the ES file containing audio. <output-file> is the resultant TS file. Switches: -quiet, -q Only output error messages. -verbose, -v Output information about each audio/video frame. -x Output diagnostic information. -h264 The video stream is H.264 (the default) -avs The video stream is AVS -vidrate <hz> Video frame rate in Hz - defaults to 25Hz. -rate <hz> Audio sample rate in Hertz - defaults to 44100, i.e., 44.1KHz. -cd Equivalent to -rate 44100 (CD rate), the default. -dat Equivalent to -rate 48000 (DAT rate). -adts The audio stream is ADTS (the default) -l2 The audio stream is MPEG layer 2 audio -mp2adts The audio stream is MPEG-2 style ADTS regardless of ID bit -mp4adts The audio stream is MPEG-4 style ADTS regardless of ID bit -ac3 The audio stream is Dolby AC-3 in ATSC -patpmtfreq <f> PAT and PMT will be inserted every <f> video frames. by default, f = 0 and PAT/PMT are inserted only at the start of the output stream. Limitations =========== For the moment, the video input must be H.264 or AVS, and the audio input ADTS, AC-3 ATSC or MPEG layer 2. Also, the audio is assumed to have a constant number of samples per frame. esmerge <video-file> <audio-file> <output-file> TS tools version 1.11, esmerge built Nov 11 2008 17:15:46 Merge the contents of two Elementary Stream (ES) files, one containing video data, and the other audio, to produce an output file containing Transport Stream (TS). Files: <video-file> is the ES file containing video. <audio-file> is the ES file containing audio. <output-file> is the resultant TS file. Switches: -quiet, -q Only output error messages. -verbose, -v Output information about each audio/video frame. -x Output diagnostic information. -h264 The video stream is H.264 (the default) -avs The video stream is AVS -vidrate <hz> Video frame rate in Hz - defaults to 25Hz. -rate <hz> Audio sample rate in Hertz - defaults to 44100, i.e., 44.1KHz. -cd Equivalent to -rate 44100 (CD rate), the default. -dat Equivalent to -rate 48000 (DAT rate). -adts The audio stream is ADTS (the default) -l2 The audio stream is MPEG layer 2 audio -mp2adts The audio stream is MPEG-2 style ADTS regardless of ID bit -mp4adts The audio stream is MPEG-4 style ADTS regardless of ID bit -ac3 The audio stream is Dolby AC-3 in ATSC -patpmtfreq <f> PAT and PMT will be inserted every <f> video frames. by default, f = 0 and PAT/PMT are inserted only at the start of the output stream. Limitations =========== For the moment, the video input must be H.264 or AVS, and the audio input ADTS, AC-3 ATSC or MPEG layer 2. Also, the audio is assumed to have a constant number of samples per frame. SEE ALSO
The full documentation for esmerge is maintained as a Texinfo manual. If the info and esmerge programs are properly installed at your site, the command info esmerge should give you access to the complete manual. esmerge 1.11 November 2008 ESMERGE(1)